WD's My Book Studio Edition II dual-drive, quad-interface external storage system for Mac offers optimum performance for creative professionals. Lightning-fast FireWire 800 or eSATA interfaces combined with RAID 0 (striping) yields the speed you need for fast, smooth video and audio editing, rendering complex 3D objects or special effects, and saving huge blocks of data in record time. Set the system to RAID 1 (mirroring) for the peace of mind in knowing that if one drive in this two-drive system ever fails, the system continues to run and your data is safe. Includes automatic data backup software, user-serviceability, a 5-year limited warranty, and is compatible with Apple Time Machine.